Bicycle lock



Nov. 16, 1937. R. P, HOLSEN 2,099,606

BICYCLE LOCK Filed oct. 20, 1956 2 sheets-sheet 1 ATTORNEYS NV. 16, 1937. R, P HOLSEN 2,099,606

BICYCLE LOCK i Filed Oct. 20, 1936 2 Sheets-Sheet 2 ATTORNEYS Patented Nov. 16, 1937 airco srAri-.as

reinar `f BICYCLE Looxr y Ralph P. Helsen, Milwaukee, Wis. Application october zo, 1936, semi No. wenn 2V Claims. .(oll '7o- 227) The invention relates toa cycle lock and more especially to a built-in bicycle lock.

The primary object of the invention is the provision of a lock of this character, wherein there is built into the upper rear wheel fork of the frame oi a bicycle a lock serviceable for locking the driving wheel of such bicycle and replacing the old style padlock so often lost or left away from such cycle, the lock which is built into the bicycle can not mar the nish on the frame of Such cycle and avoids the necessity of a tool case for the storage of the lock when not in use.

Another object of the invention is the provision oi a lock of this character, wherein the construction thereof is novel in form and is practically theft-proof and when in locking position will assure maximum protection against the stealing of the bicycle or the operation of such bicycle by an unauthorized person.

A further object of the invention is the provision of a lock of this character, which is simple in construction, thoroughly reliable and eiiicient in its operation, at all times with the bicycle,V

readily and easily handled and inexpensive to rmanufacture and install.

With these and other objects in view, the in vention consists in the features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawings, which disclose the preferred embodiment of the invention and pointed out in the claims hereunto appended.

In the accompanying drawings:

Figure l is a fragmentary side elevation of a bicycle showing the lock constructed in accordance with the invention applied.

Figure 2 is an enlarged rear elevation partly in section of the upper rear wheel fork oi the bicycle showing in detail the lock, one position thereof being indicated by dotted lines and the other position by full lines.

Figure 3 is a sectional view on the line 3--3 of Figure 2.

Figure 4 is a fragmentary plan view of the lock showing its cover piece open.

Figure 5 is a horizontal sectional View showing a modification of lock.

Similar reference characters indicate corresponding parts throughout the several views in the drawings.

Referring to the drawings in detail, A desig nates generally a portion of a bicycle frame which is of standard kind and B the upper rear wheel fork of such frame. In one arm or limb of this fork B is formed a circular housing Iii in which is' fitted the lock constituting the present invention and hereinafter fully described.

This lock includes a rotating casing ii accommodating a cylinder i2 for tumbler mechanism I3. The tumbler mechanism I3 coacts with the housing iii to lock the casing in a turned position. The tumbler mechanism is controlled by a key iii insertable in' a keyway I5 provided in the cylinder I2.

The casing I! is provided with a lateral barrel extension it' in which operates a throw bolt or locking pin ii having at its inner end a cam disp-laceable head Ii! having contact with a cam it coacting with the cylinder I2. The other arm or limb of the fork opposite the housing Ii] is provided with a keeper 2li which is formed by indenting the inner side of the said arm or limb of the fork B and in this keeper is received the free end of the bolt or pin I'I when moved to locking position. It isunderstood that when the bolt or pin is in locking position it straddles the fork B and is disposed between the spokes of the rear driving wheel of the bicycle so that the latter is retarded or barred against rotation.

The housing I0 is eut away or provided with a clearance 2! for the barrel extension I6 to per-A mit the casing Ii to rotate in the housing Iii for the swinging of the bolt or pin l'! to operative or inoperative position.

Beneath the housing I0 and provided in that limb or arm having said housing is a recess 22 which accommodates and conceals the bolt or pin I1 when in inoperative position.

Surrounding the bolt or pin l1 and Working against the head I8 is a coiled expansion spring 23 which functions to hold the head in contact or in working relation to the cam I9. The coiled expansion spring 23 is of such tension as to hold the head in Contact with the cam I9 While the bolt il is swung into position. Then when the casing II is stopped in a horizontal position the cam I9 and the cylinder I2 continue their path and force the bolt I1 into the keeper 20 in the opposite arm of the fork.

The mouth of the keyway I5 is closed by a cover plate 24 pivoted at 25 exteriorly on the housing I0 and this cover plate has acting therewith a spring 26 which serves to urge the plate to closing position when the key I4 is removed from the keyway I5in the cylinder I 2. 0

The bolt or pin Il carries a guide lug 21 which plays in a guide way 28 and in this manner the said pin or bolt can not be turned or rotated to ydislodge the relation of the head I8 with the 5 cam I9. 5

In the Working of the lug normally the bolt or pin il is in the recess 22 as shown by dotted lines in Figure 2 of the drawings. When the bolt or pin il is moved to operative position it Will straddle the fork B and engage in the keeper 20, .the tumbler mechanism locking the said bolt or pin in this position while the head I8 riding the cam I9 will hold the bolt in its thrown locked position.

In Figure 5 of the drawings there is shown a slight modiiication wherein the housing 29 is independent of the fork B and is made secure thereon by a clamp 30, the locking bolt or pin Si being engageable in a keeper 32 which is independent and separate of the said fork B and is made fast thereon by a clamp 33.

In Figures 1 to 4 of the drawings the lock is built into the bicycle frame while in Figure 5 of the drawings there is shown the modified form which is built into such frame but is separate therefrom and made fast thereto by the clamp herenbefore described.

What is claimed is:

l. A lock of the character described comprising a housing for carriage upon a Wheel fork of a bicycle frame, a turning casing tting said housing and having a barrel extension, a locking bolt slidable in said barrel extension, a tumbler cylinder tted Within the housing and said casing and Vhaving a cam for action upon the bolt to move it to locking position, the bolt when in locking position being adapted to bridge a spoked portion of a bicycle Wheel, and means acting with the bolt to hold it in working relation to the cam, the said fork having a recess for accommodating the bolt when in unlocked position.

2. A lock of the character described comprising a housing for carriage upon a Wheel fork of a bicycle frame, a turning casing tting said housing and having a barrel extension, a locking'bolt slidable in said barrel extension, a .tumbler cylinder fitted within the housing and said casing and having a cam for action upon the bolt to move it to locking position, the bolt when in locking position being adapted to bridge a spoked portion of a bicycle wheel, means acting with the bolt to hold it in Working relation to the cam, the said fork having a recess for accommodating the bolt when in unlocked position, and means on the bolt for guiding it to and from locking position.

Y RALPH P. HOLSEN. 

